M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

back up light stays on while in forward gears

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Old 09-09-2019, 10:28 PM
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2006 cls 500
Talking back up light stays on while in forward gears

HELLO well me again and still a newbie, why would my back up light stay on in forward gears put in park it goes out also left signal light will not work when backup light stays on. Any ideas or suggestion would be very much appreciated, Thank you in advance,silly huh, 1999 ml 430

Last edited by gucci888; 09-09-2019 at 10:34 PM. Reason: forgot to put the model and year sorry
Old 09-10-2019, 05:25 AM
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The back-up lamp switch inside the Range Recognition Switch is faulty and must be replaced.

This calls for removal of the shifter and then you must dismantle the shifter to replace the switch.

You have two options, buy a used shifer or replace the Range Sw. which depends on your ability to do so.
Old 09-10-2019, 10:33 PM
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Thumbs up thank you very much

Originally Posted by Maj. Dundee



The back-up lamp switch inside the Range Recognition Switch is faulty and must be replaced.

This calls for removal of the shifter and then you must dismantle the shifter to replace the switch.

You have two options, buy a used shifer or replace the Range Sw. which depends on your ability to do so.

thank you i had it apart and you would not believe the things i found in there bobby pins and plastic tooth picks i think they have been in there a while, was wondering why i couldn't get it to shift to lower gears, NOW I KNOW, and they probably shorted the switch too. ordered a used shifter and will replace as soon as it arrives. thank you again for your responce and diagram
Old 09-21-2019, 03:45 PM
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good afternoon as suggested by Maj. Dundee i replaced the shifter today and reverse light still stays on when in gear. any other suggestions im scratching my head here
Old 09-23-2019, 08:10 AM
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The reverse lamp switch is very simple. Once the key is turned on or the eng. is running, fuse #16 B-U Lamp Fuse is activated and the GRAY wire from the fuse will show 12v.

When the shifter is put in REVERSE the Back-Up switch closes the contact and activates both Back-Up lamps via the other GRAY wire.

You either have bought a faulty shifter with the same problem or there is wiring problem.
Old 09-23-2019, 10:56 AM
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Thumbs up

Thanks again, i hope i repaired yesterday so far so good,
Old 09-23-2019, 11:10 AM
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Originally Posted by gucci888
Thanks again, i hope i repaired yesterday so far so good,

Don't understand what you are saying.
Old 09-23-2019, 11:20 AM
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sorry i repaired yesterday it is now working , thank you so much for information
Old 09-24-2019, 03:58 AM
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Originally Posted by gucci888
good afternoon as suggested by Maj. Dundee i replaced the shifter today and reverse light still stays on when in gear. any other suggestions im scratching my head here

But you said replacing the shifter did not correct the condition.

Explain to us how you repaired it.
Old 09-25-2019, 03:19 PM
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1st made sure all plugs into shifter were correctly pushed in, then remembered a couple of things that i did before on my SLK , disconnected the battery for 30 minutes then reconnected , basically rebooting all on board computers. it worked no more reverse light staying on , so thank you all for the information ,i have decided when this ML 430 in finished im selling it and going back to an older MB probably look for a good 124

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